even in an old stone house does the transmission in different rooms relatively well. setting I felt as unkomplitziert and battery performance corresponds to the manufacturer's instructions (approx. 5 hours running time). However, this device only for a few weeks in operation, which is why I can not provide information on longevity - let's see. the data transfer is faster than my single-modem stick. if four devices are connected at the same time, there is little difference, as when I use alone. unkoplitziertes small part that its purpose very well satisfied. a star deduction - because of the high price.